Separate save files?

[GarrowGlitch]

How would i go about making a separate save file on pc? 

[christoph]

You could do what I have done and create a new stream account (which will have its own save). I did this to have 100 CAWs for a retro save and 100 CAWs for a modern save. I just switch steam accounts when I play the game.

[Cave Waverider]

Yes, a separate Steam account is probably the easiest and most fool-proof way. You can share your main account's Steam Library via Steam Family Sharing and just switch between accounts if you wish to use another save game.